Add alignment: soft; to YAML

[kpu]

This is required for HTML support to work.

[andrenatal]

Which version of bergamot-translator is required to have for this flag? The one we are currently using is compatible with this? I'll let @abhi-agg review this

[kpu]

It's been used in the demo since https://github.com/browsermt/bergamot-translator/blame/feb9c90429fe23423dc23c56e8d0ee19d85acec7/wasm/test_page/js/worker.js#L187

[kpu]

The HTML feature has always depended on this. So any quality of HTML you see in the extension until this is merged would indeed be terrible. Also, newer versions of the bergamot-translator code will throw an exception if HTML is on, HTML is seen in the request (the check is bypassed if only text appears), and alignment: soft is not configured at loading time.

This is making #51 even more crash-happy because even sending valid HTML will cause an error without this configured.

[abhi-agg]

@andrenatal I verified that the artifacts that the extension currently uses already included this change. So, we are safe to merge it.

[andrenatal]

@abhi-agg does this fix #51 for free?

[abhi-agg]

@andrenatal It might fix the problem that you noticed in the extension pertaining to the bad quality of html translation before. We can start passing html content (instead of plain text) to the engine again for translation and re-evaluate the quality.